Another question. One of my dukes rebelled. I crushed his army and he is now imprisoned. What do you normally do here. Banish, revoke title, kill? Actually I just revoked his title as Duke as that would only affect his opinion. However he is still a count, but in prison still. So who runs the county etc while he is in prison?
I usually revoke a title, and then ransom the prisoner. If he rebels again, he'll be weaker, and I can imprison him again. There will be a regent running the county. You can see it on the county screen, and IIRC also on the prisoner's character screen.